1 /* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If
16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
17 Cambridge, MA 02139, USA. */
20 * ANSI Standard: 4.12 DATE and TIME <time.h>
25 #if !defined(__need_time_t) && !defined(__need_clock_t)
34 /* Get size_t and NULL from <stddef.h>. */
38 #endif /* <time.h> included. */
44 /* This defines CLOCKS_PER_SEC, which is the number of processor clock
48 /* This is the obsolete POSIX.1-1988 name for the same constant. */
50 #define CLK_TCK CLOCKS_PER_SEC
53 #endif /* <time.h> included. */
56 #if !defined(__clock_t_defined) && \
57 (defined(_TIME_H) || defined(__need_clock_t))
58 #define __clock_t_defined 1
60 /* Returned by `clock'. */
61 typedef long int clock_t;
63 #endif /* clock_t not defined and <time.h> or need clock_t. */
66 #if !defined(__time_t_defined) && \
67 (defined(_TIME_H) || defined(__need_time_t))
68 #define __time_t_defined 1
70 #include <gnu/types.h>
72 /* Returned by `time'. */
73 typedef __time_t
time_t;
75 #endif /* time_t not defined and <time.h> or need time_t. */
80 /* Used by other time functions. */
83 int tm_sec
; /* Seconds. [0-61] (2 leap seconds) */
84 int tm_min
; /* Minutes. [0-59] */
85 int tm_hour
; /* Hours. [0-23] */
86 int tm_mday
; /* Day. [1-31] */
87 int tm_mon
; /* Month. [0-11] */
88 int tm_year
; /* Year - 1900. */
89 int tm_wday
; /* Day of week. [0-6] */
90 int tm_yday
; /* Days in year.[0-365] */
91 int tm_isdst
; /* DST. [-1/0/1]*/
92 long int tm_gmtoff
; /* Seconds west of UTC. */
93 __const
char *tm_zone
; /* Timezone abbreviation. */
96 #endif /* <time.h> included. */
100 /* Time used by the program so far (user time + system time).
101 The result / CLOCKS_PER_SECOND is program time in seconds. */
102 extern clock_t clock
__P ((void));
104 /* Return the current time and put it in *TIMER if TIMER is not NULL. */
105 extern time_t time
__P ((time_t *__timer
));
107 /* Return the difference between TIME1 and TIME0. */
108 extern double difftime
__P ((time_t __time1
, time_t __time0
))
109 __attribute__ ((__const__
));
111 /* Return the `time_t' representation of TP and normalize TP. */
112 extern time_t mktime
__P ((struct tm
*__tp
));
114 /* Subroutine of `mktime'. Return the `time_t' representation of TP and
115 normalize TP, given that a `struct tm *' maps to a `time_t' as performed
116 by FUNC. Keep track of next guess for time_t offset in *OFFSET. */
117 extern time_t __mktime_internal
__P ((struct tm
*__tp
,
118 struct tm
*(*__func
) (const time_t *,
123 /* Format TP into S according to FORMAT.
124 Write no more than MAXSIZE characters and return the number
125 of characters written, or 0 if it would exceed MAXSIZE. */
126 extern size_t strftime
__P ((char *__s
, size_t __maxsize
,
127 __const
char *__format
, __const
struct tm
*__tp
));
130 /* Parse S according to FORMAT and store binary time information in TP.
131 The return value is a pointer to the first unparsed character in S. */
132 extern char *strptime
__P ((__const
char *__s
, __const
char *__fmt
,
137 /* Return the `struct tm' representation of *TIMER
138 in Universal Coordinated Time (aka Greenwich Mean Time). */
139 extern struct tm
*gmtime
__P ((__const
time_t *__timer
));
141 /* Return the `struct tm' representation
142 of *TIMER in the local timezone. */
143 extern struct tm
*localtime
__P ((__const
time_t *__timer
));
145 #ifdef __USE_REENTRANT
146 /* Return the `struct tm' representation of *TIMER in UTC,
147 using *TP to store the result. */
148 extern struct tm
*__gmtime_r
__P ((__const
time_t *__timer
,
150 extern struct tm
*gmtime_r
__P ((__const
time_t *__timer
,
153 /* Return the `struct tm' representation of *TIMER in local time,
154 using *TP to store the result. */
155 extern struct tm
*__localtime_r
__P ((__const
time_t *__timer
,
157 extern struct tm
*localtime_r
__P ((__const
time_t *__timer
,
161 /* Compute the `struct tm' representation of *T,
162 offset OFFSET seconds east of UTC,
163 and store year, yday, mon, mday, wday, hour, min, sec into *TP. */
164 extern void __offtime
__P ((__const
time_t *__timer
,
168 /* Return a string of the form "Day Mon dd hh:mm:ss yyyy\n"
169 that is the representation of TP in this format. */
170 extern char *asctime
__P ((__const
struct tm
*__tp
));
172 /* Equivalent to `asctime(localtime(timer))'. */
173 extern char *ctime
__P ((__const
time_t *__timer
));
176 /* Defined in localtime.c. */
177 extern char *__tzname
[2]; /* Current timezone names. */
178 extern int __daylight
; /* If it is daylight savings time. */
179 extern long int __timezone
; /* Seconds west of UTC. */
181 /* Set time conversion information from the TZ environment variable.
182 If TZ is not defined, a locale-dependent default is used. */
183 extern void __tzset
__P ((void));
187 extern char *tzname
[2];
189 /* Return the maximum length of a timezone name.
190 This is what `sysconf (_SC_TZNAME_MAX)' does. */
191 extern long int __tzname_max
__P ((void));
193 extern void tzset
__P ((void));
195 #define tzset() __tzset()
196 #endif /* Optimizing. */
201 extern long int timezone
;
203 /* Set the system time to *WHEN.
204 This call is restricted to the superuser. */
205 extern int stime
__P ((__const
time_t *__when
));
209 /* Nonzero if YEAR is a leap year (every 4 years,
210 except every 100th isn't, and every 400th is). */
211 #define __isleap(year) \
212 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
216 /* Miscellaneous functions many Unices inherited from the public domain
217 localtime package. These are included only for compatibility. */
219 /* Like `mktime', but for TP represents Universal Time, not local time. */
220 extern time_t timegm
__P ((struct tm
*__tp
));
222 /* Another name for `mktime'. */
223 extern time_t timelocal
__P ((struct tm
*__tp
));
225 /* Return the number of days in YEAR. */
226 extern int dysize
__P ((int __year
));
230 /* POSIX.4 structure for a time value. This is like a `struct timeval' but
231 has nanoseconds instead of microseconds. */
234 long int ts_sec
; /* Seconds. */
235 long int ts_nsec
; /* Nanoseconds. */
239 /* Pause execution for a number of nanoseconds. */
240 extern int nanosleep
__P ((__const
struct timespec
*__requested_time
,
241 struct timespec
*__remaining
));
247 #endif /* <time.h> included. */
249 #endif /* <time.h> not already included. */